Performance plateau when keepalives enabled

[James Matthews]

Yes

fs.file-max = 65535

James


On Mon, Mar 8, 2010 at 2:21 PM, powderhound <nginx-forum at nginx.us> wrote:
>
> > When I run the benchmark with keepalive_timeout 65, nginx is
> > very slow (5-20 seconds delay) to accept new connections as soon
> > as it reaches 1500 concurrent connections. It plateaus here: it
> > completes all the requests but it never exceeds approximately
> > 1500 concurrent connections.
>
> Most likely you hit some network-related limit of your OS or some
> firewall inbetween. Check if firewalls have enough number of
> state entries, your OS isn't limited by number of sockets, network
> buffers and so on.
>
>
> Thank you for replying.  I should have mentioned, I have tested
> with firewall completely disabled and the following sysctls which
> I believe should be sufficient.
>
> net.core.rmem_max = 16777216
> net.core.rmem_default = 16777216
> net.core.wmem_max = 16777216
> net.core.wmem_default = 16777216
> net.core.netdev_max_backlog = 262144
> net.core.somaxconn = 262144
> net.ipv4.tcp_syncookies = 1
> net.ipv4.tcp_max_orphans = 262144
> net.ipv4.tcp_max_syn_backlog = 262144
> net.ipv4.tcp_synack_retries = 2
> net.ipv4.tcp_syn_retries = 2
>
> Is there anything else I can try?
>
> Thanks!
> Steve
>
> Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,61482,61624#msg-61624
>
>
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